风积沙地层大跨公路隧道施工过程力学行为分析
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摘要
采用三维数值模拟和现场监测的手段,对风积沙地层大跨公路隧道超前支护效果、工法参数优化、围岩压力释放和沉降发展规律进行分析。通过计算结果与监测数据的对比分析,得出了风积沙地层隧道开挖过程中围岩压力的变化形态、二次衬砌施作时机和最终形变荷载大小以及沉降发展等规律。分析结果表明:旋喷桩超前支护将掌子面潜在失稳区域控制在旋喷壳下部掌子面前方D/2范围(D为单洞开挖跨度14m);三台阶法施工台阶长度宜取(1/3～1/2)D;二次衬砌落后下台阶掌子面的距离宜取D/2;二次衬砌分担荷载较大,分担比例约为50%。
The effect of advanced support,parameters optimization of construction method,rules of surrounding rock pressure release and settlement development were analyzed via three-dimensional numerical simulation and in-situ monitoring to study mechanical behavior in the construction of large span highway tunnel in aeolian sand strata.Surrounding rock pressure changing shape,timing of secondary lining construction,ultimate deformation load and settlement development rules during tunnel excavation in aeolian sand strata were figured out by contrastive analysis of numerical values and field monitoring values.The results show that advanced support with chemical churning pile limits potential instability area of tunnel working face to D/2 under the shell of piles(D is the excavation span of tunnel,D=14 m).Three-bench method of construction should take the bench length of(1/3-1/2)D,the distance of secondary lining behind the working face of the bottom step should be D/2.The secondary lining bears about 50% of external pressure.
The effect of advanced support,parameters optimization of construction method,rules of surrounding rock pressure release and settlement development were analyzed via three-dimensional numerical simulation and in-situ monitoring to study mechanical behavior in the construction of large span highway tunnel in aeolian sand strata.Surrounding rock pressure changing shape,timing of secondary lining construction,ultimate deformation load and settlement development rules during tunnel excavation in aeolian sand strata were figured out by contrastive analysis of numerical values and field monitoring values.The results show that advanced support with chemical churning pile limits potential instability area of tunnel working face to D/2 under the shell of piles(D is the excavation span of tunnel,D=14 m).Three-bench method of construction should take the bench length of(1/3-1/2)D,the distance of secondary lining behind the working face of the bottom step should be D/2.The secondary lining bears about 50% of external pressure.
引文
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[3]陈建勋,杨忠,袁雪戡.秦岭终南山特长公路隧道大埋深段施工监测及分析[J].建筑科学与工程学报,2006,23(3):71-75.CHEN Jian-xun,YANG Zhong,YUAN Xue-kan.Construction Monitoring and Measuring in Segments of Large Embedded Depth in Qinling Zhongnanshan Super-long Highway Tunnel[J].Journal of Architec-ture and Civil Engineering,2006,23(3):71-75.
[4]李术才,赵岩,李利平,等.超大断面铁路隧道施工断面综合荷载释放过程研究[J].岩土力学,2011,32(9):2845-2851.LI Shu-cai,ZHAO Yan,LI Li-ping,et al.Study of Construction Section Comprehensive Load Releasing Process of Ultra-large Section Railway Tunnel[J].Rock and Soil Mechanics,2011,32(9):2845-2851.
[5]邵勇,覃仁辉.预应力锚索框架梁边坡支护数值模拟[J].地球科学与环境学报,2010,32(3):307-310.SHAO Yong,QIN Ren-hui.Numerical Simulation of Slope Supporting for Prestressed Anchor with Frame Beam[J].Journal of Earth Sciences and Environment,2010,32(3):307-310.
[6]董长松,黄俊文,肖均.风积沙地区公路隧道施工方案研究[J].隧道建设,2011,31(2):202-207.DONG Chang-song,HUANG Jun-wen,XIAO Jun.Study on Construction Programs of Highway Tunnels in Aeolian Sand Areas[J].Tunnel Construction,2011,31(2):202-207.
[7]乔金丽,张义同,高健,等.强度折减法在盾构隧道开挖面稳定分析中的应用[J].天津大学学报,2010,43(1):14-20.QIAO Jin-li,ZHANG Yi-tong,GAO Jian,et al.Appli-cation of Strength Reduction Method to Stability Ana-lysis of Shield Tunnel Face[J].Journal of Tianjin U-niversity,2010,43(1):14-20.
[8]熊炜,范文,邓龙胜,等.基于有限元修正节理岩质边坡稳定性计算的解析解[J].地球科学与环境学报,2011,33(3):306-310.XIONG Wei,FAN Wen,DENG Long-sheng,et al.Amendment of Analytical Solution on Stability of Joint Rock Slope Based on Finite Element Method[J].Journal of Earth Sciences and Environment,2011,33(3):306-310.
[9]朱彦鹏,何江飞,李军.黄土公路隧道浅埋段管棚注浆支护机理及监测分析[J].建筑科学与工程学报,2011,28(1):11-15.ZHU Yan-peng,HE Jiang-fei,LI Jun.Support Mech-anism and Monitoring Analysis of Pipe Roof Grouting for Loess Highway Tunnel in Shallow-buried Section[J].Journal of Architecture and Civil Engineering,2011,28(1):11-15.
[10]陈建勋,乔雄.黄土隧道浅埋偏压洞口段套拱结构受力监测与分析[J].建筑科学与工程学报,2011,28(1):100-105.CHEN Jian-xun,QIAO Xiong.Mechanical Monitoring and Analysis of Umbrella Arch Structure in Shallow-buried Bias Loess Tunnel Entrance[J].Journal of Ar-chitecture and Civil Engineering,2011,28(1):100-105.
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